In a bowl, combine all spicy seed brittle ingredients plus a pinch of salt until well incorporated. Spread on parchment lined sheet pan to 1/8 inch thick with back of spatula. Bake in 350 degree oven until golden brown, about 20 minutes. Once cool, break into small pieces.
While brittle is cooling, prepare the peaches. Brush with olive oil and sprinkle with salt. Heat grill to medium high heat and grill peaches a few minutes per side. Let cool.
To prepare the balsamic dressing, mix balsamic vinegar, lemon juice, salt and pepper, garlic and honey in a bowl. Add 1/4 cup olive oil and whisk until emulsified.
Assemble the salad in a large salad bowl. Toss the arugula with 1-2 T of balsamic dressing. Add peaches, feta and brittle pieces. Toss lightly then serve immediately. Serves 4.